Laminar Air Flow. ISO 5 (Class 100) and cleaner facilities rely on unidirectional, or laminar, airflow. Laminar airflow means that filtered air is uniformly supplied in one direction (at a fixed velocity) in parallel streams, usually vertically.
Turbulent Air Flow.Cleanrooms up to ISO 6 (Class 1,000) do not require laminar airflow and may utilize a non-unidirectional, or turbulent, airflow. This means the air is not regulated for direction and speed.
The advantage of laminar over turbulent airflow is that it provides a uniform environment and prevents air pockets where contaminants might congregate